Husband refuses to explain anything to me
There's no reason to rely on DH for explanations, when there is so much information readily available. But he might be right about not dwelling on things which feed your worries and which are entirely hypothetical
No-one can predict what a future conflict will be like. We know what's happened on other conflicts, and we can learn from that. We can guess what might happen politically, and military research analysts will plan accordingly .
Whether the politicians will make the right budgets available to MOD to have the right capabilities in the right place is a different matter. For example, thee withdrawal of the garrisons from Germany seemed like a good idea at the time.
The forces are at their smallest numbers. But augmentation will be by recruitment, not conscription. Conflict is (bizarrely) good for recruitment. But the defence budget wouid need to be increased, and do we have the money for that.
UK could in theory be attacked - it's within missile range of potential aggressors. But that's not likely. An attack on one NATO member is an attack on all, and don't see why even Putin would want NATO actively involved at this stage.
Conscription won't happen - the modern battlespace is higher tech and personnel need more training (even if you do also need numerous boots on the ground to actually take territory). But there may be a call for young men and women to join up - as the brute strength roles are no longer the be-all and end-all, there's far less reason to limit to just men. I doubt DC would be evacuated- the population isn't that compliant. I think however that people may indeed seek to leave cities if NATO went into an active war, or send their DC off to granny's - it'll be the same sort of impetus to do sonething 11th hour that drives things like panic buying.
More likely by far is cyber attack on critical national infrastructure